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There is no Grade Stamp above the Serial Number where its supposed to be on the water table. I am Showing a D and 4 10 showing on the Flats (where the weight of the barrel is supposed to be)(the 10 is slightly lower in line with the 4). This piece has been sized with an actual 12 gauge shell which fits perfect,
The serial number puts it at 1879 manufactured but I am still a little in the dark.
I also remember reading somewhere that there is a possibility of no Grade letters such as AH, BH, CH etc. now if that's the case, I wonder how I am going to identify this Parker.
I am reaching out to see if someone would so kindly in guiding me to light

Try looking at the grade pictured on this site. On the left side of the www.parkerguns.org page is a link to grades. Click that and then read about each grade and there are pictures of both hammer and hammerless guns. Look that over and see how your gun matches up.

At that time period, the lack of grade stamps is not uncommon. But, at that time, the grades were clearly defined, for the most part. The D indicates damascus barrels, which makes it at least a grade 2 gun.